To "lessen" means to make something smaller in amount, degree, or size. This can apply to various contexts, such as reducing noise levels, cutting down on expenses, or decreasing the time spent on a task. The goal of lessening is often to improve efficiency or create a more manageable situation. In environmental discussions, people often talk about how to lessen pollution or waste. For example, using less plastic can help lessen the impact on oceans and wildlife. By adopting practices that reduce consumption, individuals and communities can contribute to a healthier planet.